<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告 -->
      <el-alert title="添加商品信息" type="info" center show-icon closable></el-alert>

      <!-- 步骤条 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- 使用一个统一表单包裹Tag -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
        label-position="top"
      >
        <!-- Tag栏 -->
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <!-- 基本信息项 -->
          <el-tab-pane label="基本信息" name="0">
            <!-- 表单项 -->
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="addForm.goods_cat"
                :options="cateList"
                :props="cateProps"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <!-- 商品参数项 -->
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <!-- 循环渲染复选框 -->
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <!-- 商品属性 -->
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <!-- 商品图片 -->
          <el-tab-pane label="商品图片" name="3">
            <!-- action:要上传到的api地址 
            on-preview:点击预览时触发 
            on-remove:点击×时触发
            on-success: 上传成功是触发-->
            <el-upload
              :action="uploadURL"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <!-- 商品内容 -->
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>

            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt class="previewImg" />
    </el-dialog>
  </div>
</template>
<script>
// 导入工具库
import _ from "lodash";

export default {
  data() {
    return {
      //激活的step
      activeIndex: "0",
      //添加商品的表单对象
      addForm: {
        goods_name: "",
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        goods_cat: [], //商品所属的分类数组
        pics: [], // 图片数组
        goods_introduce: "", // 商品描述
        attrs: [] // 存放所有表单项的数据
      },
      //添加表单的验证对象
      addFormRules: {
        goods_name: [
          { required: true, message: "请输入商品名称", trigger: "blur" }
        ],
        goods_price: [
          { required: true, message: "请输入商品价格", trigger: "blur" }
        ],
        goods_weight: [
          { required: true, message: "请输入商品重量", trigger: "blur" }
        ],
        goods_number: [
          { required: true, message: "请输入商品数量", trigger: "blur" }
        ],
        goods_cat: [
          { required: true, message: "请输入商品分类", trigger: "blur" }
        ]
      },
      //所有商品分类的数组
      cateList: [],
      //商品分类级联配置项
      cateProps: {
        expandTrigger: "hover",
        label: "cat_name",
        value: "cat_id",
        children: "children"
      },
      //动态参数数据
      manyTableData: [],
      //静态属性数据
      onlyTableDate: [],
      //上传图片的地址
      uploadURL: "http://127.0.0.1:8888/api/private/v1/upload",
      // 点击上传图片按钮的请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem("token")
      },
      // 图片预览地址
      previewPath: "",
      //控制图片预览对话框
      previewVisible: false
    };
  },
  created() {
    //获取商品分类数据
    this.getCateList();
  },
  methods: {
    //获取商品分类
    async getCateList() {
      const { data: res } = await this.$http.get("categories");

      if (res.meta.status !== 200) {
        return this.$message.error("获取商品分类失败");
      }

      this.cateList = res.data;
      console.log(this.cateList);
    },
    //级联选择器选择项发生变化触发
    handleChange() {
      //如果不是选择第三级 则清空
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = [];
      }
    },
    //Tab标签发生切换时触发
    beforeTabLeave(activeName, oldActiveName) {
      //如果Tab标签是0，且商品分类没有选择，则不允许标签跳转
      if (oldActiveName === "0" && this.addForm.goods_cat.length !== 3) {
        this.$message.error("请选择商品分类");
        return false;
      }
    },
    //tab 被选中时触发
    async tabClicked() {
      //当选中了 商品参数 tab页签 发起请求获取数据
      if (this.activeIndex === "1") {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "many" }
          }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取动态参数失败");
        }
        //将每一项的attr_vals拆分成数组
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(" ");
        });
        this.manyTableData = res.data;
      } else if (this.activeIndex === "2") {
        //商品属性
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: "only" }
          }
        );

        if (res.meta.status !== 200) {
          return this.$message.error("获取静态属性识失败");
        }
        console.log(res.data);
        this.onlyTableDate = res.data;
      }
    },
    //处理图片预览的函数
    handlePreview(file) {
      console.log(file);
      this.previewPath = file.response.data.url;
      this.previewVisible = true;
    },
    //移除图片时触发
    handleRemove(file) {
      // 1.获取将要删除图片的临时路径
      const filePath = file.response.data.tmp_path;

      // 2.在图片数组中找到删除图片的索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath);

      // 3.删除
      this.addForm.pics.splice(i, 1);
      console.log(this.addForm);
    },
    //图片上传成功时触发
    handleSuccess(response) {
      console.log(response);
      //拼接图片信息
      const picInfo = {
        pic: response.data.tmp_path
      };
      //添加到图片数组pics
      this.addForm.pics.push(picInfo);

      console.log(this.addForm);
    },
    // 添加商品
    add() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) {
          return this.$message.error("请填写必要的项");
        }

        // 表单验证通过
        const form = _.cloneDeep(this.addForm); // 深拷贝一份
        form.goods_cat = form.goods_cat.join(",");

        // 处理动态和静态数据 并添加到form表单的一个属性
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(" ") // attr_value接收字符串
          };
          // 添加到 addForm.attrs 数组
          this.addForm.attrs.push(newInfo);
        });

        // 处理静态属性
        this.onlyTableDate.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_vals: item.attr_vals
          };
          // 添加到 addForm.attrs 数组
          this.addForm.attrs.push(newInfo);
        });

        // 将处理好的动态和静态数据 赋值给 form 用与后面提交到接口
        form.attrs = this.addForm.attrs;
        console.log(form);

        // 添加商品 商品的名称必须唯一
        const {data: res} = await this.$http.post("goods", form);

        if(res.meta.status !== 201){
          return this.$message.error('添加商品失败')
        }

        this.$message.success('添加商品成功')

        //编程式跳转
        this.$router.push('/goods')
  
      });
    }
  },
  computed: {
    //获取三级分类的id
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2];
      }

      return null;
    }
  }
};
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>